[ I had this written before an internet outage. I might as well still post it even though something similar was already posted. ]

First, the solution is to set Purity

#!/usr/bin/perl

use strict;
use Data::Dumper;

my $var1 = { temp => "123" };
my $hash_ref;
push @{$hash_ref->{test1}}, $var1;
push @{$hash_ref->{test2}}, $var1;

print Dumper($hash_ref);

my $dump = do {
    local $Data::Dumper::Purity = 1;
    Dumper($hash_ref);
};

my $VAR1;
eval "$dump; 1" or die $@;

print Dumper($VAR1);
[download]

$VAR1 = {
          'test1' => [
                       {
                         'temp' => '123'
                       }
                     ],
          'test2' => [
                       $VAR1->{'test1'}[0]
                     ]
        };
$VAR1 = {
          'test1' => [
                       {
                         'temp' => '123'
                       }
                     ],
          'test2' => [
                       $VAR1->{'test1'}[0]
                     ]
        };
[download]

But really, Data::Dumper is not the right tool. Storable can best represent Perl data structures. If you want something human-readable, both JSON and YAML cover all the basics.

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